package com.example.tablet;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;

/**
 * An activity representing a single Item detail screen. This activity is only
 * used on handset devices. On tablet-size devices, item details are presented
 * side-by-side with a list of items in a {@link ItemListActivity}.
 * <p>
 * This activity is mostly just a 'shell' activity containing nothing more than
 * a {@link ItemDetailFragment}.
 */
public class ItemDetailActivity extends FragmentActivity {

	@Override
	protected void onCreate( Bundle savedInstanceState ) {
		super.onCreate( savedInstanceState );
		setContentView( R.layout.activity_item_detail );

		// Show the Up button in the action bar.
		getActionBar().setDisplayHomeAsUpEnabled( true );

		// savedInstanceState is non-null when there is fragment state
		// saved from previous configurations of this activity
		// (e.g. when rotating the screen from portrait to landscape).
		// In this case, the fragment will automatically be re-added
		// to its container so we don't need to manually add it.
		// For more information, see the Fragments API guide at:
		//
		// http://developer.android.com/guide/components/fragments.html
		//
		if ( savedInstanceState == null ) {
			// Create the detail fragment and add it to the activity
			// using a fragment transaction.
			Bundle arguments = new Bundle();
			arguments.putString( ItemDetailFragment.ARG_ITEM_ID, getIntent().getStringExtra( ItemDetailFragment.ARG_ITEM_ID ) );
			ItemDetailFragment fragment = new ItemDetailFragment();
			fragment.setArguments( arguments );
			getSupportFragmentManager().beginTransaction().add( R.id.item_detail_container, fragment ).commit();
		}
	}

	@Override
	public boolean onOptionsItemSelected( MenuItem item ) {
		switch ( item.getItemId() ) {
			case android.R.id.home:
				// This ID represents the Home or Up button. In the case of this
				// activity, the Up button is shown. Use NavUtils to allow users
				// to navigate up one level in the application structure. For
				// more details, see the Navigation pattern on Android Design:
				//
				// http://developer.android.com/design/patterns/navigation.html#up-vs-back
				//
				NavUtils.navigateUpTo( this, new Intent( this, ItemListActivity.class ) );
				return true;
		}
		return super.onOptionsItemSelected( item );
	}
}
